I found this file that will allow you to load 1 custom ringtone to your i730 until there is a better way. I did not write this program, simply found it on another board, according to the README credits should go to Allen Smith. Dont forget to read the README.txt as it will explain how to use this java app.

i really feel the i730 is *&*&*&*&.. despite havin the edge over the i95 for having 65k colors.. the screen to me is just way too small to look at.. i rather wait for the i860 or watever that phone was to come out which got a built in camera n bigger screen. which would probably be the same price as the i730's price right now when the i860 comes out